CN112952280B

CN112952280B - Battery cell

Info

Publication number: CN112952280B
Application number: CN202011460888.9A
Authority: CN
Inventors: 朴相勋
Original assignee: Samsung SDI Co Ltd
Current assignee: Samsung SDI Co Ltd
Priority date: 2019-12-11
Filing date: 2020-12-11
Publication date: 2023-07-25
Anticipated expiration: 2040-12-11
Also published as: EP3836300A3; US11594794B2; EP3836300B1; CN112952280A; US20210184322A1; EP3836300A2; HUE064241T2; KR20210073888A; PL3836300T3

Abstract

A battery, comprising: the battery cell comprises a first surface, a second surface and a side surface, wherein the first surface and the second surface are opposite to each other, a first electrode and a second electrode are respectively positioned on the first surface and the second surface, and the side surface is connected with the first surface and the second surface; an insulating sheet disposed on the first surface of the cell and defining a conductive aperture facing the first electrode; and an electrode plate disposed on the insulating sheet and electrically connected to the first electrode through the conductive hole.

Description

Battery cell

Technical Field

Aspects of one or more embodiments relate to a battery.

Background

In general, a secondary battery refers to a battery that can be repeatedly charged and discharged, unlike a primary battery that cannot be charged. The secondary battery may be used as an energy source or an uninterruptible power supply for devices such as mobile devices, electric vehicles, hybrid vehicles, electric bicycles. The secondary battery may be used alone, or secondary battery modules each including a plurality of secondary batteries connected as one unit may be used, depending on the type of external device in which the secondary battery is used.

Disclosure of Invention

According to aspects of one or more embodiments, a battery is provided in which an output terminal having a relatively large size is provided for a relatively small electrode of a core cell, so that a circuit board may be easily electrically connected to the battery, the circuit board may have freely designed conductive points, and the possibility of malfunction, such as conductive malfunction, may be reduced.

Additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the embodiments of the disclosure as set forth.

According to one or more embodiments, a battery includes: the battery cell comprises a first surface, a second surface and a side surface, wherein the first surface and the second surface are opposite to each other, a first electrode and a second electrode are respectively positioned on the first surface and the second surface, and the side surface is connected with the first surface and the second surface; an insulating sheet disposed on the first surface of the cell and having a conductive aperture defined therein that faces the first electrode; and an electrode plate disposed on the insulating sheet and electrically connected to the first electrode through the conductive hole.

In an embodiment, the first and second surfaces of the cell may have a circular shape, and the side surface of the cell may include an inverted circumferential surface connecting the first and second surfaces.

In an embodiment, the cell may have a cylindrical shape with a height less than a diameter of the first surface.

In an embodiment, an aspect ratio of the height of the cell to the diameter of the first surface is in a range of about 5.4:12 to about 5.4:14.

In an embodiment, the first electrode of the cell may be located at a central position of the first surface, and the second electrode of the cell may extend from all of the second surface to a peripheral position of the first surface via the side surface, the peripheral position surrounding the central position of the first surface.

In an embodiment, the first electrode and the second electrode may be spaced apart from each other on the first surface with an insulating gap therebetween for electrical insulation between the first electrode and the second electrode.

In an embodiment, the electrode plate may be configured as a first output terminal of the battery, the first output terminal being connected to the first electrode to externally supply a potential of the first electrode, and the second electrode may be configured as a second output terminal of the battery.

In an embodiment, the conductive via may expose at least a portion of the first electrode from the insulating sheet.

In an embodiment, the conductive connection member may be disposed in the conductive hole for making electrical connection between the first electrode and the electrode plate provided at the upper and lower sides of the insulating sheet.

In an embodiment, the conductive connection member may include a compressible conductor that is compressible so as to be compressed between the electrode plate and the first electrode in a direction facing each other to contact the electrode plate and the first electrode.

In an embodiment, the conductive connection member may include an Anisotropic Conductive Film (ACF).

In an embodiment, the thickness of the conductive connection member may be greater than the thickness of the insulating sheet surrounding the conductive hole before the conductive connection member is compressed, and may be equal to the thickness of the insulating sheet after the conductive connection member is compressed.

In an embodiment, the electrode plate may contact the conductive connection member disposed in the conductive hole and the insulating sheet surrounding the conductive hole.

In an embodiment, the size of the electrode plate may be larger than the size of the first electrode.

In an embodiment, the radius of the electrode plate may be greater than the radius of the first electrode defined at the center of the first surface and less than the radius of the first surface.

In an embodiment, the insulating sheet may have a circular ring shape surrounding the conductive hole defined at a central position of the insulating sheet, and the insulating sheet may be disposed between the second electrode at a peripheral position of the first surface and the electrode plate connected to the first electrode through the conductive hole.

In an embodiment, the insulating sheet may be defined by an inner circumference and an outer circumference forming concentric circles, and the inner circumference corresponds to a boundary of the conductive hole.

In an embodiment, the expanded end of the second electrode extending from the second surface to a peripheral position of the first surface via the side surface may be located on the inner circumference of the insulating sheet or between the inner circumference and the outer circumference of the insulating sheet.

In an embodiment, the radius of the outer circumference of the insulating sheet may be greater than the radius of the electrode plate and less than the radius of the first surface.

In an embodiment, the conductive holes, the inner and outer circumferences, the electrode plates, and the first surface of the insulating sheet may have concentric circular shapes.

Drawings

The foregoing and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description, taken in conjunction with the accompanying drawings, in which:

fig. 1 is a perspective view illustrating a battery according to an embodiment;

fig. 2 is an exploded perspective view illustrating the battery shown in fig. 1;

fig. 3 is a plan view illustrating the insulating sheet shown in fig. 2;

fig. 4 is a plan view illustrating an electrode plate shown in fig. 2; and is also provided with

Fig. 5A and 5B are views illustrating a pre-compression state and a post-compression state of the conductive connection member, respectively.

Detailed Description

Reference will now be made in detail to the various embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. In this regard, the present embodiments may take different forms and should not be construed as limited to the descriptions set forth herein. Accordingly, hereinafter, embodiments are described by referring to the drawings in order to explain aspects of the present disclosure. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. When placed before a series of elements, a statement such as "at least one of …" modifies the entire series of elements and does not modify individual elements in the series.

It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another element.

As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be understood that the terms "comprises" and "comprising," as used herein, specify the presence of stated features or components, but do not preclude the presence or addition of one or more other features or components.

The dimensions of various features in the drawings may be exaggerated for convenience of description. In other words, since the sizes and thicknesses of the components in the drawings may be arbitrarily shown for convenience of description, the following embodiments are not limited thereto.

It will be understood that when a layer, region, or element is referred to as being "connected to" another layer, region, or element, it can be directly connected to the other layer, region, or element or be indirectly connected to the other layer, region, or element with one or more intervening layers, regions, or elements. For example, it will be understood that when a layer, region, or element is referred to as being "electrically connected to" another layer, region, or element, it can be directly electrically connected to the other layer, region, or element, or intervening layers, regions, or elements may be present.

Spatially relative terms, such as "below …," "below …," "below …," "above …," "above …," and the like, may be used herein to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, then described as "under" or "beneath" other elements or features would then be oriented "over" or "above the other elements or features. Thus, the exemplary term "below …" may include both orientations above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments of the inventive concepts belong. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Herein, a battery according to some example embodiments will be described with reference to the accompanying drawings.

Fig. 1 is a perspective view illustrating a battery according to an embodiment; fig. 2 is an exploded perspective view illustrating the battery shown in fig. 1; fig. 3 is a plan view illustrating the insulating sheet 20 shown in fig. 2; fig. 4 is a plan view illustrating the electrode plate 30 shown in fig. 2; and fig. 5A and 5B are views illustrating a pre-compression state and a post-compression state of the conductive connecting member 50, respectively.

Referring to fig. 1 and 2, a battery may include: a cell 10 comprising: a first surface 10a and a second surface 10b, the first surface 10a and the second surface 10b being opposite to each other, and a first electrode 11 and a second battery 12 being formed on the first surface 10a and the second surface 10b, respectively; a side surface 10c connecting the first surface 10a and the second surface 10b to each other; an insulating sheet 20 disposed on the first surface 10a of the cell 10 and including a conductive hole 20' facing the first electrode 11; and an electrode plate 30 disposed on the insulating sheet 20 and electrically connected to the first electrode 11 through the conductive hole 20'.

The cell 10 may include: a first surface 10a and a second surface 10b opposite to each other; and a side surface 10c connecting the first surface 10a and the second surface 10b to each other. For example, according to an embodiment, the cell 10 may include: a first surface 10a and a second surface 10b having a circular shape; and a side surface 10c forming an inverted circumferential surface by which the first surface 10a and the second surface 10b are connected to each other. For example, according to an embodiment, the battery cell 10 may be formed in an elongated cylindrical shape, so that the battery cell 10 may have a small height H that is smaller than the diameter of the first surface 10a (the diameter is twice the radius R1 of the first surface 10 a). For example, the aspect ratio, i.e., the ratio of the height H to the diameter (twice the radius R1) of the cell 10 may be in the range of about 5.4:12 to about 5.4:14.

First and second electrodes 11 and 12 having opposite polarities may be formed on the first and second surfaces 10a and 10b of the battery cell 10. In an embodiment, for example, the first electrode 11 may be formed at a central position of the first surface 10a, the second electrode 12 may be formed entirely on the second surface 10b and the side surface 10c, and may extend from the side surface 10c to a peripheral position around the central position of the first surface 10 a. The first electrode 11 and the second electrode 12 may be formed together on the first surface 10a at different positions. For example, the first electrode 11 may be formed at a central position of the first surface 10a, and the second electrode 12 may be formed at a peripheral position of the first surface 10 a. In this case, the first electrode 11 and the second electrode 12 formed on the first surface 10a may be spaced apart from each other with an insulating gap (g) therebetween, and thus may be electrically insulated from each other. In the present specification, the expression that the first electrode 11 and the second electrode 12 are formed on the first surface 10a and the second surface 10b of the battery cell 10 may mean that the first electrode 11 and the second electrode 12 are formed at the center positions of the first surface 10a and the second surface 10 b.

The insulating sheet 20 may be disposed on the first surface 10a of the battery cell 10. A conductive hole 20 'may be formed at a central position of the insulating sheet 20 so that at least a portion of the first electrode 11 formed on the first surface 10a may be exposed through the conductive hole 20'. In an embodiment, for example, the conductive via 20 'may have a circular shape, and the conductive via 20' and the first surface 10a having the circular shape may be concentric by the same central axis C. In one embodiment, the insulating sheet 20 may include a polymeric resin material such as Polyimide (PI).

The insulating sheet 20 may have a shape surrounding the conductive hole 20 'and may be disposed between the second electrode 12 formed at the circumferential position of the first surface 10a and the electrode plate 30 connected to the first electrode 11 through the conductive hole 20', so that the second electrode 12 and the first electrode 11 may be insulated from each other by the insulating sheet 20. In other words, the insulating sheet 20 may be disposed between the first surface 10a of the battery cell 10 and the electrode plate 30, so that the second electrode 12 formed at the circumferential position of the first surface 10a may be insulated from the electrode plate 30 connected to the first electrode 11.

Referring to fig. 3, the insulating sheet 20 may be defined between the first surface 10a having a circular shape and the conductive hole 20 'having a circular shape by an inner circumference (I) (corresponding to a boundary of the conductive hole 20') and an outer circumference (O), which are formed as concentric circles having the same central axis C, and the insulating sheet 20 may have a circular ring shape or an annular shape between the inner circumference (I) and the outer circumference (O). Here, the inner circumference (I) of the insulating sheet 20 may correspond to the boundary of the conductive hole 20', and in this specification, the inner circumference (I) of the insulating sheet 20 and the conductive hole 20' may form substantially the same circular profile.

In an embodiment, each of the first surface 10a having a circular shape, the conductive hole 20 'having a circular shape, and the inner circumference (I) (corresponding to the boundary of the conductive hole 20') and the outer circumference (O) of the insulating sheet 20 may be concentric by the same central axis C. The inner circumference (I) of the insulating sheet 20 may correspond to a boundary between the insulating sheet 20 and the conductive hole 20', and in an embodiment, the outer circumference (O) of the insulating sheet 20 may have a radius RO between a radius of the conductive hole 20' and a radius R1 of the first surface 10 a. That is, the radius RO of the outer circumference (O) may be smaller than the radius R1 of the first surface 10a, but larger than the radius RI of the conductive hole 20' or the inner circumference (I). In an embodiment, since the radius RO of the outer circumference (O) forming the outer circumference of the insulating sheet 20 is smaller than the radius R1 of the first surface 10a, the insulating sheet 20 may not protrude from the battery cell 10 along the outer circumference of the battery cell 10, and since the battery may not have a portion protruding from the battery cell 10, the battery may be effectively used in a small-sized device.

As shown by the one-dot chain line in fig. 2, the expanded end of the second electrode 12 (which extends from the second surface 10b to the peripheral position of the first surface 10a via the side surface 10c of the cell 10) may be located on the inner circumference (I) of the insulating sheet 20 or between the inner circumference (I) and the outer circumference (O) of the insulating sheet 20. If the expanded end (see the one-dot chain line in fig. 2) of the second electrode 12 provided on the first surface 10a is located within the inner circumference I of the insulating sheet 20, the first electrode 11 and the second electrode 12 will be exposed through the conductive hole 20 'and thus may be electrically connected to the electrode plate 30 through the conductive hole 20', thereby causing a short circuit.

Referring to fig. 2 and 4, the electrode plate 30 may be disposed on the insulating sheet 20 and may be electrically connected to the first electrode 11 through the conductive hole 20' of the insulating sheet 20. Since the electrode plate 30 is connected to the first electrode 11 through the conductive hole 20', the electrode plate 30 may have the same potential as the first electrode 11 of the battery cell 10, and may serve as a first output terminal for supplying the potential of the first electrode 11 to the outside. In an embodiment, the potential of the first electrode 11 of the battery cell 10 may be supplied to the outside through the electrode plate 30 serving as the first output terminal, and the second electrode 12 of the battery cell 10 may itself serve as the second output terminal. For example, if the first output terminal (electrode plate 30) of the battery may be formed on the upper surface of the battery (the upper surface corresponds to the first surface 10a of the battery cell 10), the second output terminal of the battery may be formed on the lower surface of the battery (the lower surface corresponds to the second surface 10b of the battery cell 10).

In an embodiment, the electrode plate 30 may have a size larger than that of the first electrode 11 formed on the first surface 10a of the battery cell 10. In an embodiment, for example, the electrode plate 30 and the first electrode 11 may have a circular shape corresponding to the first surface 10a of the battery cell 10, and the radius R3 (see fig. 4) of the electrode plate 30 may be greater than the radius R11 (see fig. 2) of the first electrode 11. In an embodiment, the electrode plate 30 has a size larger than that of the first electrode 11 relatively small and formed at the center of the first surface 10a of the battery cell 10, and a first output terminal (electrode plate 30) having an enlarged size may be provided to the outside of the battery. For example, the first output terminal provided by the electrode plate 30 and the second output terminal provided by the second electrode 12 of the battery cell 10 may have dimensions corresponding to the upper and lower surfaces of the battery, for example, equal to or at least similar to those of the upper and lower surfaces of the battery, and thus, electrical connection between the battery and a circuit board (not shown) may be easily achieved. For example, the contact points of the contact springs of a circuit board (not shown) can be freely designed and the possibility of faults, such as the possibility of conduction faults, can be reduced.

Referring to fig. 4, in an embodiment, the radius R3 of the electrode plate 30 may be smaller than the radius R1 of the first surface 10a of the battery cell 10. Therefore, it is impossible for the electrode plate 30 to protrude from the battery cell 10 along the outer circumference of the battery cell 10, and the battery can be effectively used in a small-sized device because the electrode plate 30 does not form a portion protruding from the battery cell 10.

In an embodiment, the electrode plate 30 and the insulating sheet 20 may have a circular shape corresponding to the first surface 10a of the battery cell 10, and the radius R3 of the electrode plate 30 may be smaller than the radius RO of the outer circumference (O) of the insulating sheet 20. Accordingly, it is possible to prevent or substantially prevent a situation in which a portion of the electrode plate 30 is exposed from the insulating sheet 20 and forms a short circuit with the second electrode 12 formed at the peripheral position of the first surface 10a of the battery cell 10.

The electrode plate 30 may include a metal plate having high electrical conductivity, and in an embodiment, the electrode plate 30 may include a nickel plate or a nickel alloy plate.

Referring to fig. 2, 5A and 5B, a conductive hole 20 'may be formed through the insulating sheet 20 such that the first surface 10a of the battery cell 10 (or the first electrode 11 formed on the first surface 10 a) and the electrode plate 30 provided at the upper and lower sides of the insulating sheet 20 may be electrically connected to each other through the conductive hole 20'. For example, the conductive connection member 50 may be disposed in the conductive hole 20' as an electrical connection medium between the first surface 10a of the battery cell 10 (or the first electrode 11 formed on the first surface 10 a) and the electrode plate 30. The conductive connection member 50 may be disposed in the conductive hole 20 'and between the electrode plates 30 and the first electrode 11 respectively disposed on the respective sides of the insulating sheet 20 where the conductive hole 20' is formed, and thus may be compressed due to being pressed in directions facing each other, so that the electrode plates 30 and the first electrode 11 may be electrically connected to each other in a state in which the conductive connection member 50 and the electrode plates 30 and the first electrode 11 are in close contact due to resilience or stretchability of the compressed conductive connection member 50. In one embodiment, the conductive connecting member 50 may comprise a compressible conductor. For example, the compressible conductor may include a contact spring or an Anisotropic Conductive Film (ACF) such as a contact spring. In one embodiment, the conductive connection member 50 may include an ACF.

Referring to fig. 5A and 5B, in an embodiment, in a state in which an ACF (conductive connection member 50) is placed in a conductive hole 20' and between an electrode plate 30 and a first electrode 11, by pressing the electrode plate 30 disposed over a first surface 10a of the battery cell 10, the ACF (conductive connection member 50) disposed between the electrode plate 30 and the first electrode 11 may be compressed toward the first electrode 11, and thus conductive particles dispersed in an insulating base material of the ACF (conductive connection member 50) may be connected to each other, so that the electrode plate 30 and the first electrode 11 may be electrically connected to each other through the ACF (conductive connection member 50). In this case, since it is compressed between the electrode plate 30 and the first electrode 11, the thickness of the ACF (conductive connection member 50) may be reduced from the pre-compression thickness t5' (which is greater than the post-compression thickness t5 corresponding to the thickness of the insulating sheet 20), and as a result, the total thickness of the battery may be reduced, so that the battery may be elongated in the height direction thereof. In an embodiment, an ACF having a large reduction in thickness upon compression is used as the conductive connection member 50, and therefore, the battery can be more slim than in the case where a contact elastic portion such as a contact spring is used as the conductive connection member 50.

In other words, in an embodiment, the conductive connecting member 50 disposed in the conductive via 20' may have a pre-compression thickness t5' (which is greater than the thickness of the insulating sheet 20 surrounding the conductive via 20 ') before compression, and a post-compression thickness t5 (which is equal to the thickness of the insulating sheet 20) after compression. For example, since the thickness of the conductive connection member 50 can be reduced to a thickness (compressed thickness t 5) equal to the thickness of the insulating sheet 20 after compression, the conductive connection member 50 does not form an additional height from the insulating sheet 20. In other words, the compressed thickness t5 of the conductive connection member 50 may be equal to the thickness of the insulating sheet 20, so that the electrode plate 30 disposed on the insulating sheet 20 may not be spaced upward from the insulating sheet 20. That is, in an embodiment, the electrode plate 30 may be in contact with the conductive connection member 50 disposed in the conductive hole 20 'and the insulating sheet 20 surrounding the conductive hole 20'.

As described above, according to one or more embodiments, an output terminal having a relatively large size is provided for a relatively small electrode of the battery cell 10, so that a circuit board can be easily electrically connected to a battery, the circuit board can have freely designed conductive points, and the possibility of malfunction, such as conductive malfunction, can be reduced.

It should be understood that the embodiments described herein are to be understood in a descriptive sense and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as set forth in the appended claims.

Claims

1. A battery, comprising:

the battery cell comprises a first surface, a second surface and a side surface, wherein the first surface and the second surface are opposite to each other, a first electrode and a second electrode are respectively positioned on the first surface and the second surface, and the side surface is connected with the first surface and the second surface;

an insulating sheet disposed on the first surface of the cell and having a conductive aperture defined therein that faces the first electrode; and

an electrode plate disposed on the insulating sheet and electrically connected to the first electrode through the conductive hole,

wherein a conductive connection member is provided in the conductive hole for making electrical connection between the electrode plate located on the upper side of the insulating sheet and the first electrode located on the lower side of the insulating sheet; and is also provided with

Wherein the conductive connecting member includes a compressible conductor that is compressible so as to be compressed between the electrode plate and the first electrode in a direction facing each other to contact the electrode plate and the first electrode.

2. The battery of claim 1, wherein

The first and second surfaces of the cell have a circular shape, and

the side surface of the cell includes an inverted circumferential surface connecting the first surface and the second surface.

3. The battery of claim 1, wherein the cells have a cylindrical shape with a height less than a diameter of the first surface.

4. The battery of claim 3, wherein an aspect ratio of the height of the cells to the diameter of the first surface is in a range of 5.4:12 to 5.4:14.

5. The battery of claim 1, wherein

The first electrode of the battery cell is positioned at the center of the first surface, and

the second electrode of the cell extends from the entire second surface to a peripheral location of the first surface via the side surface, the peripheral location surrounding the central location of the first surface.

6. The battery of claim 5, wherein the first electrode and the second electrode are spaced apart from each other on the first surface with an insulating gap therebetween for electrical insulation between the first electrode and the second electrode.

7. The battery of claim 1, wherein

The electrode plate is configured as a first output terminal of the battery, which is connected to the first electrode and provides the potential of the first electrode to the outside, and

the second electrode is configured as a second output terminal of the battery.

8. The battery of claim 1, wherein the conductive aperture exposes at least a portion of the first electrode from the insulating sheet.

9. The battery of claim 1, wherein the conductive connection member comprises an anisotropic conductive film.

10. The battery of claim 1, wherein a thickness of the conductive connecting member is greater than a thickness of the insulating sheet surrounding the conductive aperture before the conductive connecting member is compressed, and is equal to the thickness of the insulating sheet after the conductive connecting member is compressed.

11. The battery according to claim 10, wherein the electrode plate contacts the conductive connection member provided in the conductive hole and the insulating sheet surrounding the conductive hole.

12. The battery of claim 1, wherein the size of the electrode plate is greater than the size of the first electrode.

13. The battery of claim 12, wherein a radius of the electrode plate is greater than a radius of the first electrode defined at a central location of the first surface and less than a radius of the first surface.

14. The battery of claim 1, wherein

The insulating sheet has a circular ring shape surrounding the conductive hole defined at a central position of the insulating sheet, and

the insulating sheet is disposed between the second electrode at a peripheral position of the first surface and the electrode plate connected to the first electrode through the conductive hole.

15. The battery according to claim 1, wherein the insulating sheet is defined by an inner circumference and an outer circumference that define concentric circles, and the inner circumference corresponds to a boundary of the conductive hole.

16. The battery according to claim 15, wherein an expanded end of the second electrode extending from the second surface to a peripheral position of the first surface via the side surface is located on the inner circumference of the insulating sheet or between the inner circumference and the outer circumference of the insulating sheet.

17. The battery of claim 15, wherein a radius of the outer circumference of the insulating sheet is greater than a radius of the electrode plate and less than a radius of the first surface.

18. The battery according to claim 15, wherein the conductive holes, the inner and outer circumferences, the electrode plates, and the first surface of the insulating sheet have concentric circle shapes.